PySide：可移动项目在鼠标事件中的位置重置

问题描述：

我有PySide的问题（我在编程方面仍然是菜鸟）。我创建了名为RBNode的自定义QGraphicsItem。它应该停留在mouseReleaseEvent发生的位置。我不知道为什么，但是当我试图不止一次地移动RBNode类的实例时，这个实例的位置重置。我怎样才能避免重置职位？在此先感谢您的帮助。PySide：可移动项目在鼠标事件中的位置重置

#!/usr/bin/python 
# -*- coding: utf-8 -*- 

import sys 
from PySide.QtGui import * 
from PySide.QtCore import * 

class RBNode(QGraphicsItem): 
    def __init__(self, factorView = None): 
     super(RBNode, self).__init__() 
     self.factor = factorView 
     self.pressed = False 
     self.x = self.pos().x() 
     self.y = self.pos().y() 
     self.setFlag(QGraphicsItem.ItemIsMovable) 

    def boundingRect(self): 
     return QRectF(-50,-50,100,100) 

    def paint(self, painter, option, widget): 
     rect = QRectF(-50,-50,100,100) 

     if self.pressed: 
      painter.setBrush(Qt.red) 
     else: 
      painter.setBrush(Qt.darkGray) 

     painter.drawEllipse(rect) 

    def mousePressEvent(self, event): 
     self.pressed = True 
     self.update() 
     QGraphicsItem.mousePressEvent(event) 

    def mouseReleaseEvent(self, event): 
     self.pressed = False 
     self.update() 
     QGraphicsItem.mouseReleaseEvent(event) 


class RBGraphicView(QGraphicsView): 
    def __init__(self): 
     super(RBGraphicView, self).__init__() 
     self.factorView = 1 

     self.initScene() 
     self.initGui() 

    def initGui(self): 
     self.setWindowTitle("A Simple Animation") 
     self.show() 

    def initScene(self): 
     self.rbScene = QGraphicsScene(self) 
     self.rbAddItem(self.rbScene) 
     self.setScene(self.rbScene) 

    def rbAddItem(self, scene): 

     rbNode1 = RBNode(self.factorView) 
     rbNode1.setPos(100,100) 
     scene.addItem(rbNode1) 


if __name__ == '__main__': 
    try: 
     myApp = QApplication(sys.argv) 
     myView = RBGraphicView() 
     myApp.exec_() 
     sys.exit(0) 

    except NameError: 
     print("Name Error:", sys.exc_info()[1]) 

    except SystemExit: 
     print("Closing Window...") 

    except Exception: 
     print(sys.exc_info()[1])

答

您在调用mousePressEvent，超类的mouseReleaseEvent的时候忘了自己作为参数。

QGraphicsItem.mousePressEvent(self, event) 

    QGraphicsItem.mouseReleaseEvent(self, event)

PySide：可移动项目在鼠标事件中的位置重置

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